Abstract
Abstract The polyacrylonitrile (PAN) nanofiber membrane prepared by the electrospinning technology was used as the matrix, and β-cyclodextrin (β-CD) was introduced into it to synthesize the composite nanofiber membrane. Taking methylene blue as the object, the adsorption performance of nanofiber membranes for dyes in the aqueous solution was studied. The structure, morphology, and specific surface area of the nanofiber membrane were characterized using FTIR, SEM, BET, XRD, and EDS. Meantime, the adsorption equilibrium was also explored. After being modified by cyclodextrin, a large number of cavity structures and hydrophobic binding sites were provided for the nanofiber membrane, and the adsorption performance was significantly improved. The results showed that the maximum adsorption capacity of the PAN/β-CD blend nanofiber membrane (at 25℃) for methylene blue was 108.66 mg g−1. The effects of pH, adsorption time, ion concentration, and adsorbent dosage on the adsorption capacity were also investigated. In addition, by fitting with the adsorption model, the adsorption process was more complex with the quasi-secondary adsorption kinetics and Langmuir isotherm adsorption model.
Highlights
Methylene blue is a phenothiazine salt that is relatively stable in air and alkaline in aqueous solution
Studies have shown that the concentration and the viscosity of the polymerization solution have a greater impact on the electrospinning process [19]
Due to the high viscosity of the spinning solution, the thickness of the synthesized fiber is uneven, which has a great influence on the adsorption experiment
Summary
Methylene blue is a phenothiazine salt that is relatively stable in air and alkaline in aqueous solution. It is widely used in the manufacture of ink and dyeing of biological and bacterial tissues, and it is used in the medical field due to its reducing and sterilizing functions. A high concentration of methylene blue is toxic and carcinogenic, which causes great damage to the human body and the environment. Since methylene blue dye is biologically toxic and carcinogenic, it is difficult to carry out biodegradation, photolysis, and oxidative decomposition by conventional methods. The most widely used adsorbents are zeolite, activated carbon, fiber membranes, and carbon-based materials [2,3]
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